What should be done after successfully resolving a customer's device problem?

After successfully resolving a customer's device problem, verifying that the problem is resolved is an essential step in the support process. This involves checking that the solution has effectively addressed the issue and that the device is functioning as expected. It ensures customer satisfaction and confirms that the technician's efforts have led to a successful outcome. By taking this step, the technician can provide reassurance to the customer, capturing any additional concerns they may have before concluding the support interaction.

The other options are less relevant in this immediate context. Informing the user of upcoming support issues may be useful for future reference but does not directly address the current resolution. Suggesting new hardware purchases might not be appropriate right after resolving an issue, as the customer may focus on their existing equipment first. Providing a long-term service plan can be beneficial in the long run, but it is not the immediate next step following a successful resolution of an existing problem.